Grass Valley 1200 Installation - Manual (Page 102)

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Section 3 Ñ Functional Description
DSK
The DSK Video Mix Multiplier (Figure 3-14) takes the DSK video and the
data from the CPU to mix the DSK fill signal on and off. The DSK Key Mix
Multiplier does the same for the DSK Key. The Video Mixer takes the DSK
Fill, the Clean Feed Video, and the DSK Key to create the Program Video
signal. The DSK video then goes through the Fade To Black Multiplier, the
Unshaper, and the Encoder to the output.
The Clean Key signal (Key 1 and Key 2 combined) is combined with the
DSK Key in the Additive Mixer. This creates a composite key which is
available as an output if black is chosen as the background.
Figure 3-14. DSK
RE
CLOCK
DSK
VIDEO
MIX
MULTIPLIER VIDEO
MIXER
FADE
TO
BLACK
MULTIPLIER
UNSHAPER
1 / KEY
D1
ENCODER
RE-
CLOCK
VARIABLE
DELAY
RE
CLOCK
DSK
KEY
MIX
MULTIPLIER
ADDITIVE
MIXER
VARIABLE
DELAY
DSK Video
Clean Feed Video
DSK Key
Clean Key
CPU
CPU
CPU
CPU
CPU
To Key Output Selectors
Program
Video